How many syllables in opossum?

Definition of opossum:

opossum (noun):

small furry Australian arboreal marsupials having long usually prehensile tails.

any of a family (didelphidae) of small- to medium-sized american marsupials that usually have a pointed snout and nearly hairless scaly prehensile tail, are typically active at night, and are sometimes hunted for their fur or meat

a common omnivorous largely nocturnal mammal (didelphis virginiana) of north and central america that is a skilled climber, that typically has a white face and grayish body and in the female a well-developed fur-lined pouch, and that when threatened may feign death by curling up the body and remaining motionless and unresponsive